在英文中，第i天的盈利可以用 "profit on day i" 表示。
来源：
"Profit" 是英文中表示盈利的常用单词，它的意思是 "an amount of money that is made in trade or business after all the costs have been subtracted"，即在扣除所有成本后，在贸易或商业中获得的金额。
例句：
"We made a profit of $500 on the sale of our house."（我们卖房子获得了500美元的盈利。）
"The company reported a profit of $1 milpon for the third quarter."（公司报告第三季度盈利100万美元。）
"She invested $10,000 in the stock market and made a profit of $5,000."（她在股票市场投资了10000美元，获得了5000美元的盈利。）
来源：
"Profit" 是英文中表示盈利的常用单词，它的意思是 "an amount of money that is made in trade or business after all the costs have been subtracted"，即在扣除所有成本后，在贸易或商业中获得的金额。
例句：
"We made a profit of $500 on the sale of our house."（我们卖房子获得了500美元的盈利。）
"The company reported a profit of $1 milpon for the third quarter."（公司报告第三季度盈利100万美元。）
"She invested $10,000 in the stock market and made a profit of $5,000."（她在股票市场投资了10000美元，获得了5000美元的盈利。）